While Apple did reconfigure the drive frame so the HD bay is larger in the newer Blade SSD/HD models. Apple so far has only used the smaller 9.5 mm 1 TB drive in their drive offerings.
With that said, I don't see any reason why the larger 15 mm drive wouldn't work here (it will be tight!) If you haven't bought the system yet I would recommend getting the SSD model and then buy the dual drive kit to add the HD. Getting the SSD later will be harder & more expensive.
I've also been toying with the idea of upgrading my home mini (2012) which has dual 2 TB drives (media server) to this exact configuration. :-}
Let us know how it goes!
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